Tool-holder.



G. AMBORN.

TOOL HOLDER.

APPLICATION FILED 31m. 1912.

1,1 20,782, Patented Dec. 15, 1914.

INVENTOR WITNESSES: 2

fine f By Aim/ways.

Tf-IE NORRIS PETERs (20., PHOTOJJTHQ. WASHINGTON. D C.

Gnonon AMBORN, 0F CHAPIN'VILLE, conivnc'rloom, ASSIGNOR T0 J. H. ,wILLIAMs a 00;, 0F BROOKLYN, ,NEW YORK, A oonronerronor NEW YORK;

'TOOIi-I-IOLDER; I

To all, whom it may concern Beit known that I, GEORGE Aiinoeiv, a

citizen of the United States, residing in Chapinville, in the county of Litchfield and State of Connecticut, have invented certain I new and useful Improvements in Tool Holders, of which the following is a specification. v

This inventionrelates to tool holders and aims to provide certain improvements therein;

The invention is particularly directed to tool holders for lathes or other machines which'are adapted to hold a cutting off or side tool, the prineipalobject being to provide means for clamping a tool or cutter rigidly upon the holder in suchmanner that it will not work loose in use.

In the preferred form of the invention the tool holder is provided with a shallow groove on one side, the edges of which are undercut and the tool is provided with beveled edges adapted to fit in the groove in the holder. Means are provided for clamp ing the tool so as to prevent longitudinal displacement, which means are inclined to the vertical axis of thetool, preferably to such an extent that the clamping means extend at right angles to the upper beveled edge of the tool. Such clamping means are best constructed as a plate extending over the upper edge of the tool near its cutting end, the plate being pressed down by a set screw or other suitable device and having on its edge opposite the tool a lip or the like for engaging the tool holder'whereby to prevent the plate from slipping.

In the drawings wherein I have illustrated one form of the invention,-Figure 1 is a side elevation of the holder and tool. Fig.2 is a top or plan view of Fig. 1. Fig. 3 is a cross section taken Fig. 1.

Referring to the drawings, let A indicate the holder body which is formed along one side with an open'groove B having undercut edges C and D. In the construction shown the edge C is continued the entire length of the tool while the edge D is interrupted at the point E, so as to permit the application to the tool of a clamping plate ,LF. Preferably the tool holder is provided near its front end with an enlargement Gr which is shown as provided with a screw- I on the line 3-3 in threaded bore II .designed to receive a set screw I v for .Specification of Letters Patent. t te 15, 9 4; Application filed February 8,1912. serial 10,67 ,413. 'i

The tool' J is; fame with upper a d."

lower beveled edgesi designed to 'fitthe un dercut edges'of the groove B so thatthe,

tool is capable of sliding within the groove,

but I is held thereln.

The clamping plate 'F is 'preferably gen tion fof "the, upper beveled edge of the tool. The set-screw I or. its equivalent which against lateral displacement" I pressesthe clamping plate, F down upon, the tool is also given af suitable inclination tdthe vertical axis of the tool, sothat it is perpendicular to the'plate F. For this purpose the threaded. bore H- in the enlargement G is inclined withrel'ation to the ver-,.

ti'cal as shown. Preferably also the upper face of the enlargement G is givenan in-, clination which corresponds to that of the lower face of the plate. I also prefer to form a lip or flange L on the side of the clamping plate which is opposite to the tool, such lip fitting over the side of the enlarge ment and preventing anyslipping or turning movement of the plate. The clamping plate bears or fulcrums on the top of the enlargement G near one side, the enlarge ment being preferably formed with a rib or fulcruinR for this purpose. The plate is best made with a tapered recess M on its upper side, surrounding the bolt I, and the latter is provided with a corresponding bevel which fits the recess.

By the present invention I'provide a tool holder in which the tool is firmly and rigidly clamped in position so that thereis little or no liability of the tool being displacedin use. The clamping plate because of its inclination to the tool presses thelatter. firmly against the bottom face of the groove and holds .the tool more effectively againstany side or end strains than when the clamp extends at right angles to the vertical axis of the tool.

While I have shown and described one form of the invention, it will be understood that I do not wish to be limitedthereto, since various changes may be made therein with a bottom and a side wall, a clamping;

plate, a fulcrum on said tool body, said clamp.-

ing plate being adapted to bear on said fulcrum andon a tool in said recess, means for applying a clamping force to said clamping plate, said clamping plate having a face thereon adapted to transmit to said tool direct components of the clamping force in directions to press the tool against the bottom and side walls of the tool recess, said clamping force acting in the direction of pressure of said clamping plate.

2. A tool holder having a tool recess therein with abottom and a side wall, and a clamping plate for engaging a beveled edge of the tool, said clamping plate having a flat underside substantially parallel with said bevel edge adapted to fulcrum on said tool holder and to bear upon the bevel edge of said tool, and means for pressing said clamping plate against the tool with direct force-components for pressing said tool against both said bottom and side walls, said means acting substantially parallel to the direction of pressure of said clamping late.

p 3. A tool holder having a toolv recess therein With a bottom and a sidewall, a

clamping plate adapted to fulcrum on the tool holder and to press upon a bevel edge of on said fulcrum and on a tool, in said recess, a screw threaded bolt, having means thereon for turning it, for applying a clamping face to said clamping plate, said clamping plate having a face thereon adapted to transmit to said tool direct components of the clamping force in directions to press the tool against the bottom and side walls of the tool recess,said clamping. force acting in the direction of pressure of said clamping plate.

In Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

GEORGE AMBORN.

Witnesses: 7 CHARLES B. HARRIS, WILLIAM G. COLE Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, I). 0." 

